Gold-filtering machine.



PATENTED AUG. 11, 1908.

T. THORDSON;

GOLD PILTERING MACHINE. APPLICATION FILED NOV. 21, 1907.

2 SHEETS-SHEET 1.

PATENTED AUG. 11, 1908.

APPLICATION FILEDNOV-21, 1907.

'2 SHEETS-SHEET 2.

Eiwoawtoz device.

UNITED sTATEs PATENT OFFICE.

THORSTEIN THORDSON, OF OAKLAND, CALIFORNIA.

GOLD-FILTERING MACHINE.

To all whom it may concern:

Be it known that I, THORSTEIN THORDSON, a subject of Norway, residing atOakland, in the county of Alameda and State of California, have inventedcertain new and useful Improvements in Gold-Filtering Machines; an I dodeclare the following to be a full, clear, and exact description of thesame, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the characters of reference markedthereon, which form a part of this application.

This invention relates to improvements in gold finding, gathering andfiltering machines, my object being to produce such a device as willseparate gold from sand, gravel and like material without the necessityofwashing or amalgamating it, thus making it possible to operate thesame in dry sections Where water power is not available. This object Iaccomplish by means of inclined troughs spaced apart one above theother, an agitating means disposed in said troughs, holes disposed inthe bottoms of the upper troughs, a blast means for the lower trough, ameans of supply for said troughs, and a vibrating means for the lowertrough; also by such other and further construction as will appear by aerusal of the following specifications and c aims.

In the drawings similar characters of reference indicate correspondingparts in the several views.

Figure 1 is a side elevation of the complete Fig. 2 is a sectional viewtaken on a line x x of Fig. 2. Fig. 3 is an end view of an air blastpipe.

Referring now more particularly to the characters of reference on thedrawings 1 and 2 desi nate suitable supporting members, secure on whichare two inclined troughs 3 and4, the bottom of the trough 3 beingprovided with a plurality of orifices 5. Disposed in the trough 3 is anagitating rake composed of two driving rods 6 having cross members 7 onwhich are agitating teeth 8. The u per end of said rake is suitablyconnecte with a driving crank 9, said rods 6 being ivotally suspended ateach end to oscillating arms 6*.

10 is a hopper or bin disposed above the Specification of LettersPatent.

Application filed November 21, 1907.

Patented Aug. 11, 1908.

Serial No. 403,127.

trough 3 and having a chute 11 discharging into the trough 3 at itsupper end.

The trough 4 is wider than the trough 3 and has its extending sidesloping inward as at 12. Also disposed in said trough 4 is an agitatingrake 13 constructed the same as that in the trough 3 and connected witha driving crank 14.

Disposed across the bottom of trough 4 are a plurality of removabletrays 15 into which the trou h 4 opens, said trays being normally 100red in position by means of locks 16 and containing quick silver 17.

Dis osed on the sides of the trough 4 are a plura ity of small wheels 18with which eccentric cams 19 are adapted to coact, said eccentric camsbeing actuated by a shaft 20 suitably connected with a driving gear 21.

22 is a blast ipe disposed intermediate the troughs 3 and 4 at theiralined edges and having orifices 23 directed toward said trough 4 andthe sloping side 12. Said pipe is suitably connected with an aircompressor 24.

In practice the gravel or sand is filled into the hopper 10 from whenceit discharges through the chute 11 into the trough 3 where it isagitated by means of the agitating rake 67--8, this agitation workingthe fine sand and gold through the orifices 5 in the bottom of thetrough 3, thence into the trough 4, while the larger stones and dirtcarry out at the lower end of the trough 3.

As the fine sand and gold passes into the trough 4 the a itating rake 13agitates the same, thus worlring the heavier gold to the bottom and intothe trays 15, while the finer, lighter sand is carried out over thesloping side 1.2 by means of the air blast from the ipe 22.

To aid the agitating rake 13 the cams 19 continually striking the wheels13 keep the trough 4 vibrating, thus aiding in settling the gold to thebottom and into the trays 15.

When desired the locks 16 may be unlocked and the trays 15 removed,emptied and replaced. Thus it will be seen that I have produced a goldfiltering machine, which substantially fulfils all the objects of theinvention as set forth herein.

WVhile this specification sets forth in detail the present and preferredembodiment of my invention, still in practice many small deviations fromsuch detail may be resorted to without departing from the spirit of theI said troughs and directed toward the bottom invention. and saidsloping side of the said wider trough, Having thus described myinvention What 1 the upper trough having openings directed I claim asnew and useful and desire to se toward the lower trough; as set forth.l5 5 cure by Letters Patent is In testimony whereof I aflix my signatureA gold filtering machine comprising stain presence of two witnesses.tionary inclined troughs disposed one above THORSTEIN THORDSON the otherand spaced apart, one of said troughs being of a greater width than theWitnesses:

My other and having a side sloping inward, and PERCY S. WEBSTER,

an air blast means disposed intermediate FRANK H. CARTER.

